Chapter 12

Variable-Rate Technology in Precision Agriculture

(book excerpts)

Variable rate technology (VRT) is a precision agriculture technique that allows farmers to apply different amounts of inputs, such as fertilizer, water, or seeds, at different rates across a field, rather than applying the same amount uniformly. This approach is based on the idea that not all parts of a field have the same needs, and by matching inputs to those specific needs, farmers can optimize crop production, reduce costs, and minimize environmental impact. Consequently, the cornerstone of implementing precision agriculture (PA) lies in dividing agricultural fields into multiple management zones based on similar agronomic characteristics, that allow for tailored management practices. Moreover, these systems offer the advantage of improving the efficiency of agricultural inputs by lowering costs and mitigating environmental pollution. The core element of VRT normally involves an integrated sensor and rate controller system. The sensor system often includes a GPS receiver and is typically used to provide georeferenced information for setting the site-specific set points for rate controllers to deliver different rates of agrochemicals to the location.

Click on the following topics for more information on variable-rate technology in precision agriculture.

Topics Within This Chapter: